Ah thanks! I've included a fix for this Firefox issue in the latest build. Let me know if it's now resolved.
You'll find a few other enhancements as well that should improve usability:
- The toolbar is now moved to the top of the screen
- You can tap the play button for a quick way to start a new game
- You can now pause a game. The play button changes to a pause button when the game starts.
- The toolbar is now hidden during gameplay. It reappears when the game is paused or ends.
- Buttons now generate a vibration on your phone when pressed. You can change the intensity or turn it off in the settings.
- You can now change the default zoom to your own preference:
- Tap on the padlock icon next to the zoom button when zoomed in to unlock the camera.
- Resize the screen using the pinch gesture.
- Tap the padlock to lock in the zoom as the new default. Next time you zoom in it will restore your custom zoom.